Data/hora: 06/06/2024 02:58:01

Biblioteca(s): | Embrapa Meio Norte / UEP-Parnaíba.
Data corrente: | 08/04/1994
Data da última atualização: | 08/04/1994
Autoria: | GARZ, J.; SCHARF, H.; STUMPE, H.; SCHERER, H. W.; SCHLIEPHAKE, W.
Título: | Effect of potassium fertilization on some chemical soil properties in a long term trial on sandy loess
Ano de publicação: | 1993
Fonte/Imprenta: | Potash Revieio, n.3, p.1-12, 1993.
Idioma: | Inglês
Conteúdo: | The effect on the soil of K fertilizer applied at rates up to 210 kg ha-1 yr-1 for 40 years was chiefly seen in differences in exchangeable and easily available (HCl sol.) in topsoil (0-40 cm). The difference in soil K level so indicated between different K fertilizer rates was due to depletion under nil and lower rates rather tahan increase at the highest rate of K fertilizer. Een so, unfertilized soil could, in recent years, deliver to crops as much as 70kg ha-1 K per annum. There were also differences in CEC due to K fertilizer treatmente. We fixation increased with  K depletion of topsoil but, independently fixation was higher in subsoil. The same holds for NH4 fixation which was K dependent. Cl from K fertilizer accumulated temporarily in subsoil indry years. Some sulphate, originating from SO2 pollution and fertilizers was retained as gypsum.
Palavras-Chave: | Adubacao quimica; Niveis de potassio; Qualidade das culturas; Rotacao de culturas; Solos arenosos.
Categoria do assunto: | --
Registro original: | Embrapa Meio Norte / UEP-Parnaíba (CPAMN-UEPP)
Exemplares: | CPAMN-UEPP - (3298-1) - ADD - SP - -- -  -  - 1994.05187 - DIS